Great explanation on Turns All Year of a truly historical weather event in the PNW
PNW Weather Analysis from Amar Andalkar
Amar is a Physicist at U-Dub... he's also a fanatical ski-mountaineer weather enthusiast....
This is a lengthy piece but if you're into snow study, it's very interesting.
27 inches on Hurricane Ridge in the Olympics
27-39 inches at Mission Ridge at the Eastern edge of the Cascades
Little to nothing in between...